What pin number for Teensy 3.6 SD card chip select pin?

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If you're connecting a SD card to the SPI pins (11, 12, 13), then you can use any other digital pin for CS.

If you're using the SD socket that's built into Teensy 3.6, use SD.begin(BUILTIN_SDCARD);

In Arduino, click File > Examples > SD and open any of those examples. The comments explain your options.
 
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